.body{
    background: skyblue;
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    .box{
        width: 600px;
        height: 250px;
        background: #ffffff;
        .ruleForm{
            margin: 30px;
        }
    }

}